Improvement in prate-bars



W. C. CHILUS.

Grate-Bar.-

Pat ented Oct. 11,1875.

No.168,6l 5.

UR- wdy 7- gwkar ESEES- W 655%?! NITED STATES PATENT OFFICE.

WALTER G. OHILDS, OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT lN GRATE-BARS.

Specification forming part of Letters Patent N 0. 168,615, dated October 11, 1875; application filed August 23, 1875. i

CASE A.

To all whom it may concern Be it known that I, WALTER 0. (Demos, of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Grate-Bars; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing forming a part of this specification, in which- Figure 1 is aperspective view of a series of grate-bars.illustrating my invention. Fig. 2 is a similar view of a single bar, the detachable lugs being broken away. Fig. 3 is a view of one of the detachable lugs.

Like letters refer to like parts wherever they occur.

My invention relates to the construction of grate-bars; and consists, first, in a grate-bar formed from Bessemer steel, and provided with suitable lugs for determining the distance between the bars when arranged to form a grate; second, in a grate-bar having detachable lugs, so that, by changing the lugs, the distance between the bars of a grate may be increased or diminished according to the quality of the fuel.

Grates and gratebars have heretofore been cast of iron,'and, while the superiority of steel for the purposes of a grate-bar has been recognized, no attempt has been made to produce such an article, for the reason that caststeel grate-bars were too expensive, and Bes semerstee], though sufficiently low-priced for the purpose, yet could not be cast.

Grate-bars when cast singly are formed with lugs or projections, which determine the space between the bars, or when cast in clusters are formed with lugs uniting the bars. I therefore propose to produce a Bessemersteel grate-bar by rolling a blank of the required form, and subsequently securing the lug or lugs to the bar in any convenient Way.

In devising a means of producing a Bessemer-steel grate-bar, I have invented a construction which is equally applicable to cast bars, as will be apparent by reference to the drawing, in which A represents a grate-bar, formed with one or more slots, a, near the upper edge, to receive the detachable lugs. b b are detachable lugs connected by a cross-piece, b, the thickness of each lug I) being equal to one-half the distance required between the grate-barsas, for instance, if the opening desired between the bars is one inch, then each lug (or side of the separating-lugs) would be one-half inch. These connected lugs b b are inserted in the bar, then turned and secured by wedging or otherwise. The connected lugs b b are made of different sizes, and to be interchangeable upon the same bars, so that a grate can be speedily altered to suit different qualities of fuel.

In making castmetal grates the slots are formed at the time of casting. Inrnaking Bessemer-steel bar, the ingot is first rolled into bars of the proper crosssection, and then cut into suitable lengths, after which a number of slots corresponding to the number of lugs desired, are worked in the blank, and the lugs b 12 secured in the manner specified.

The advantages of my Bessemer-steel bar are, lightness, durability, and strength. A bar of one-half the diameter of the usual castiron bar will support greater weight, wear" longer, and glve better draft-space between the bars; and the detachable and interchangeable lugs permit of the space between the bars being increased or decreased at pleasure.

I do not herein claim a Bessemer-steel gratebar; but

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is- V A grate-bar, having independent detachable lugs attached to the same, substantially as set forth.

In testimony whereof I, the said WALTER G. OHILDS, have hereunto set my hand.

WALTER O. CHILDS. Witnesses F. W. BITTER, Jr., E. V. MoOANDLEss. 

